A Northern Pacific steam locomotive leads a passenger train at Seattle, Washington, circa 1935. The train is passing one of the Northern Pacific's iconic semaphore signals at left. Photo by J.A. Turner. Other Subject Classes: steam locomotive, passenger train

A Holland America Westours full-dome passenger car is switched by Burlington Northern locomotive 385 at West Seattle, Washington in 1986. Photo by J.M. Fredrickson. Other Subject Classes: passenger car, diesel locomotive

A four car Amtrak passenger train at Tacoma, Washington in July 1975. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train